<template>
    <div>
        <!-- 面包屑导航区域 -->
        <el-breadcrumb separator="/">
            <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
            <el-breadcrumb-item>商品管理</el-breadcrumb-item>
            <el-breadcrumb-item>添加商品</el-breadcrumb-item>
        </el-breadcrumb>

        <!-- 卡片视图 -->
        <el-card>
            <!-- 提示区域 -->
            <el-alert title="添加商品信息" type="info" show-icon center :closable="false"></el-alert>
            <!-- 步骤条 -->
            <el-steps :space="200" :active="activeIndex - 0" finish-status="success" align-center>
                <el-step title="基本信息"></el-step>
                <el-step title="商品参数"></el-step>
                <el-step title="商品属性"></el-step>
                <el-step title="商品图片"></el-step>
                <el-step title="商品内容"></el-step>
                <el-step title="完成"></el-step>
            </el-steps>

            <!-- tab栏区域 -->
            <el-form :model="addForm" :rules="addFormRules" ref="addRuleFormRef" label-width="100px" label-position="top">
                <el-tabs :tab-position="'left'" v-model="activeIndex" :before-leave="beforeTabLeave" @tab-click="tabClicked">
                    <el-tab-pane label="基本信息" name="0">
                        <el-form-item label="商品名称" prop="goods_name">
                            <el-input v-model="addForm.goods_name"></el-input>
                        </el-form-item>
                        <el-form-item label="商品价格" prop="goods_price">
                            <el-input v-model="addForm.goods_price" type="number"></el-input>
                        </el-form-item>
                        <el-form-item label="商品重量" prop="goods_weight">
                            <el-input v-model="addForm.goods_weight" type="number"></el-input>
                        </el-form-item>
                        <el-form-item label="商品数量" prop="goods_number">
                            <el-input v-model="addForm.goods_number" type="number"></el-input>
                        </el-form-item>
                        <el-form-item label="商品分类" prop="goods_cat">
                            <el-cascader v-model="addForm.goods_cat" :options="catelist" :props="cateProps" @change="handleChange"></el-cascader>
                        </el-form-item>
                    </el-tab-pane>
                    <el-tab-pane label="商品参数" name="1">
                        <!-- 渲染表单的item项 -->
                        <el-form-item :label="item.attr_name" v-for="item in manyTableData" :key="item.attr_id">
                            <!-- 复选框组 -->
                            <el-checkbox-group v-model="item.attr_vals">
                                <el-checkbox :label="cb" v-for="(cb, i) in item.attr_vals" :key="i" border></el-checkbox>
                            </el-checkbox-group>
                        </el-form-item>
                    </el-tab-pane>
                    <el-tab-pane label="商品属性" name="2">
                        <el-form-item :label="item.attr_name" v-for="item in onlyTableData" :key="item.attr_id">
                            <el-input v-model="item.attr_vals"></el-input>
                        </el-form-item>
                    </el-tab-pane>
                    <el-tab-pane label="商品图片" name="3">
                        <!-- action图片上传的地址 -->
                        <el-upload :action="uploadURL" :on-preview="handlePreview" :on-remove="handleRemove" list-type="picture" :headers="henderObj" :on-success="handleSuccess">
                            <el-button size="small" type="primary">点击上传</el-button>
                        </el-upload>
                    </el-tab-pane>
                    <el-tab-pane label="商品内容" name="4">
                        <!-- 富文本编辑器组件 -->
                        <quill-editor v-model="addForm.goods_introduce"></quill-editor>
                        <!-- 添加商品的按钮 -->
                        <el-button type="primary" class="btnAdd" @click="add">添加商品</el-button>
                    </el-tab-pane>
                </el-tabs>
            </el-form>
        </el-card>

        <!-- 图片预览 -->
        <el-dialog title="图片预览" :visible.sync="previewDialogVisible" width="50%">
            <img :src="previewPath" alt="" class="previewImg">
        </el-dialog>
    </div>
</template>

<script>
import _ from 'lodash';

export default {
    data() {
        return {
            activeIndex: '0',
            // 添加商品的表单数据对象
            addForm: {
                goods_name: '',  //名称
                goods_price: 0,  //价格
                goods_weight: 0,  //重量
                goods_number: 0,  //数量
                goods_cat: [],  //商品所属的分类数组
                pics: [],  //图片数组
                goods_introduce: '',  //商品介绍
                attrs: []
            },
            addFormRules: {
                goods_name: [
                    { required: true, message: '请输入商品名称', trigger: 'blur' }
                ],
                goods_price: [
                    { required: true, message: '请输入商品价格', trigger: 'blur' }
                ],
                goods_weight: [
                    { required: true, message: '请输入商品价格', trigger: 'blur' }
                ],
                goods_number: [
                    { required: true, message: '请输入商品价格', trigger: 'blur' }
                ],
                goods_cat: [
                    { required: true, message: '请选择商品分类', trigger: 'blur' }
                ]
            },
            // 商品分类列表
            catelist: [],
            cateProps: {
                expandTrigger: 'hover',
                label: 'cat_name',
                value: 'cat_id',
                children: 'children'
            },
            // 商品的动态参数列表
            manyTableData: [],
            // 商品的静态属性列表
            onlyTableData: [],
            // 上传图片的URL地址
            uploadURL: 'http://127.0.0.1:8888/api/private/v1/upload',
            // 图片上传组件的headers
            henderObj: {
                Authorization: window.sessionStorage.getItem('token')
            },
            previewPath: '',
            // 控制图片的预览的显示与隐藏
            previewDialogVisible: false
        }
    },
    created() {
        this.getCateList();
    },
    methods: {
        // 获取所有的商品分类数据
        async getCateList() {
            const { data: res } = await this.$http.get('categories');
            if (res.meta.status !== 200) {
                return this.$message.error('获取商品分类数据失败!');
            }
            this.catelist = res.data;
            // console.log(this.catelist);
        },
        // 监听级联选择器的变化
        handleChange() {
            // console.log(this.addForm.goods_cat);
            if (this.addForm.goods_cat.length !== 3) {
                this.addForm.goods_cat = [];
            }
        },
        beforeTabLeave(activeName, oldActiveName) {
            // console.log('即将离开的标签页名字是:' + oldActiveName);
            // console.log('即将进入的标签页名字是:' + activeName);
            // return false;
            if (oldActiveName === '0' && this.addForm.goods_cat.length !== 3) {
                this.$message.error('请先选择商品分类!');
                return false;
            }
        },
        async tabClicked() {
            if (this.activeIndex === '1') {
                // 访问的是动态参数面板
                const { data: res } = await this.$http.get(`categories/${this.cateId}/attributes`, {
                    params: { sel: 'many' }
                });

                if (res.meta.status !== 200) {
                    this.$message.error('获取动态参数列表失败!');
                }
                
                res.data.forEach(item => {
                    item.attr_vals = item.attr_vals.length === 0 ? [] : item.attr_vals.split(' ');
                });
                this.manyTableData = res.data;
            } else if (this.activeIndex === '2') {
                const { data: res } = await this.$http.get(`categories/${this.cateId}/attributes`, {
                    params: { sel: 'only' }
                });
                
                if (res.meta.status !== 200) {
                    this.$message.error('获取静态属性列表失败!');
                }
                this.onlyTableData = res.data;
            }
        },
        // 处理图片预览效果
        handlePreview(file) {
            console.log(file);
            this.previewPath = file.response.data.url;
            this.previewDialogVisible = true;
        },
        // 处理移除图片的操作
        handleRemove(file) {
            // 1.获得将要删除的图片的临时路径
            const filePath = file.response.data.tmp_path;
            // 2.从pics数组中,找到这个图片对饮的索引
            const i = this.addForm.pics.findIndex(x => {
                x.pic === filePath;
            });
            // 3.调用数组的 splice 方法, 把图片信息对象, 从 pics 数组中移除
            this.addForm.pics.splice(i, 1);
            // console.log(this.addForm);
        },
        // 监听图片上传成功的事件
        handleSuccess(response) {
            // 拼接得到一个图片信息对象
            const picInfo = { pic: response.data.tmp_path };
            // 将图片信息对象, push 到 pics数组中
            this.addForm.pics.push(picInfo);
        },
        add() {
            this.$refs.addRuleFormRef.validate(async valid => {
                if (!valid) {
                    return this.$message.error('请填写必要的表单项!');
                }
                // 深拷贝
                const form = _.cloneDeep(this.addForm);
                form.goods_cat = form.goods_cat.join(',');
                // 处理动态参数
                this.manyTableData.forEach(item => {
                    const newInfo = {
                        attr_id: item.attr_id, 
                        attr_value: item.attr_vals.join(' ')
                    };
                    this.addForm.attrs.push(newInfo);
                });
                // 处理静态属性
                this.onlyTableData.forEach(item => {
                    const newInfo = {
                        attr_id: item.attr_id,
                        attr_value: item.attr_vals
                    };
                    this.addForm.attrs.push(newInfo);
                });
                form.attrs = this.addForm.attrs;
                
                // 发起添加商品的请求
                const { data: res } = await this.$http.post('goods', form);
                // console.log(res);
                if (res.meta.status !== 201) {
                    return this.$message.error(res.meta.msg);
                }
                this.$message.success('添加商品成功!');
                this.$router.push('/goods');
            });
        }
    },
    computed: {
        cateId() {
            if (this.addForm.goods_cat.length === 3) {
                return this.addForm.goods_cat[2];
            }
        }
    }
}
</script>

<style lang="less" scoped>
.el-checkbox {
    margin: 0 5px 0 0;
}

.previewImg {
    width: 100%;
}

.btnAdd {
    margin-top: 15px;
}
</style>
